Abstract: According to the present apparatus, there are provided a first throttle body 10 and a second throttle body 10 that define multiple intake passages corresponding to arranged cylinders on one side and on the other side of a V-type engine respectively, a first throttle shaft 31 that simultaneously opens/closes the multiple throttle valves 20 disposed in the first throttle body 10, and a second throttle shaft 32 that simultaneously opens/closes the multiple throttle valves 20 disposed in the second throttle body 10, and a motor 52 and a gear train 52a, 53 to 57 are employed as drive means 50 that rotatably drives the first throttle shaft 31 and the second throttle shaft 32. Consequently, open/close operations are synchronously carried out without generating a phase shift. Electronic control is provided for multi-throttle apparatuses applied to V-type engines of two-wheeled vehicles and the like, and the synchronization among throttle valves is secured.

Abstract: With the throttle apparatus of the present invention having a throttle valve 30 disposed at an intake passage, a throttle shaft 240 to open and close the throttle valve 30, a DC motor 51 to drive the throttle shaft 40, and so on, a second drive means 60 is disposed to exert return force to the throttle shaft 40 only for returning the throttle valve 30 to the rest position. With this structure, since return force is not exerted with a normal operation, load to the DC motor 51 is decreased, and an open-close operation can be preformed smoothly. By returning the throttle valve to the rest position utilizing other means than spring force, load to the motor is decreased, and open-close operation is smoothed.

Abstract: According to the present apparatus, on multi-throttle apparatus provided with multiple throttle valves 20 that are respectively disposed in multiple intake passages 11, a throttle shaft 30 that simultaneously opens/closes the throttle valves 20, drive means 50 that drives the throttle shaft 30, and a return spring 60, the driving force of the drive means 50 is applied to an approximate center of the throttle shaft 30, the energizing force of the return spring 60 is applied close to the location to which the energizing force is applied, and bearings 40 are provided in mutual intervals between the multiple intake passages 11 to support the throttle shaft 30. Consequently, torsion of the throttle shaft 30 is prevented, and the throttle valves 20 are opened/closed synchronously without generating a phase shift. Consequently, electronic control is provided for multi-throttle apparatuses applied to engines of two-wheeled vehicles and the like, and the synchronization among throttle valves is secured.

Abstract: According to the present apparatus, there are provided a first throttle body 10 and a second throttle body 10 that define multiple intake passages corresponding to arranged cylinders on one side and on the other side of a V-type engine respectively, a first throttle shaft 31 that simultaneously opens/closes the multiple throttle valves 20 disposed in the first throttle body 10, and a second throttle shaft 32 that simultaneously opens/closes the multiple throttle valves 20 disposed in the second throttle body 10, and a motor 52 and a gear train 52a, 53 to 57 are employed as drive means 50 that rotatably drives the first throttle shaft 31 and the second throttle shaft 32. Consequently, open/close operations are synchronously carried out without generating a phase shift. Electronic control is provided for multi-throttle apparatuses applied to V-type engines of two-wheeled vehicles and the like, and the synchronization among throttle valves is secured.

Abstract: According to the present apparatus, there are provided throttle valves 20 that are disposed in intake passages, a throttle shaft 30 that supports the throttle valves 20 to be opened/closed, drive means 40 that rotatably drives the throttle shaft 30, and a torsion type return spring 50 that deforms in a manner interlocked with the turn of the throttle shaft 30, and returns the throttle valves 20 to a rest position on a close side, and a deformation force transmission mechanism 60 including a speed reducing gear 62 is provided to cause a torsion deformation on the return spring 50 within an angular range smaller than the rotation angle range of the throttle shaft 30. As a result, the maximum energizing force is reduced. Consequently, the maximum energizing force of the return spring is reduced on the throttle apparatus where the throttle valves are returned to the rest position by the return spring.

Abstract: With the throttle apparatus of the present invention having a throttle valve 30 disposed at an intake passage, a throttle shaft 240 to open and close the throttle valve 30, a DC motor 51 to drive the throttle shaft 40, and so on, a second drive means 60 is disposed to exert return force to the throttle shaft 40 only for returning the throttle valve 30 to the rest position. With this structure, since return force is not exerted with a normal operation, load to the DC motor 51 is decreased, and an open-close operation can be preformed smoothly. By returning the throttle valve to the rest position utilizing other means than spring force, load to the motor is decreased, and open-close operation is smoothed.

Abstract: A multiple throttle apparatus has a plurality of throttle valves respectively disposed at each air intake passage corresponding to each cylinder of an engine, a plurality of throttle shafts to support the plurality of throttle valves for each group, and a plurality of drive elements to respectively drive the throttle shafts. With this structure, open-close control of one group of the throttle valves and of the other group of throttle valves can be performed separately. Therefore, the combustion condition, namely the power, can adequately be controlled in accordance with the driving conditions, and fine control, even to perform ISC, is possible. In this manner, it becomes possible to obtain electronic control and fine control to a multiple throttle apparatus of an engine mounted on a motorcycle.

Abstract: According to the present apparatus, on multi-throttle apparatus provided with multiple throttle valves 20 that are respectively disposed in multiple intake passages 11, a throttle shaft 30 that simultaneously opens/closes the throttle valves 20, drive means 50 that drives the throttle shaft 30, and a return spring 60, the driving force of the drive means 50 is applied to an approximate center of the throttle shaft 30, the energizing force of the return spring 60 is applied close to the location to which the energizing force is applied, and bearings 40 are provided in mutual intervals between the multiple intake passages 11 to support the throttle shaft 30. Consequently, torsion of the throttle shaft 30 is prevented, and the throttle valves 20 are opened/closed synchronously without generating a phase shift. Consequently, electronic control is provided for multi-throttle apparatuses applied to engines of two-wheeled vehicles and the like, and the synchronization among throttle valves is secured.

Abstract: According to the present apparatus, there are provided throttle valves 20 that are disposed in intake passages, a throttle shaft 30 that supports the throttle valves 20 to be opened/closed, drive means 40 that rotatably drives the throttle shaft 30, and a torsion type return spring 50 that deforms in a manner interlocked with the turn of the throttle shaft 30, and returns the throttle valves 20 to a rest position on a close side, and a. deformation force transmission mechanism 60 including a speed reducing gear 62 is provided to cause a torsion deformation on the return spring 50 within an angular range smaller than the rotation angle range of the throttle shaft 30. As a result, the maximum energizing force is reduced. Consequently, the maximum energizing force of the return spring is reduced on the throttle apparatus where the throttle valves are returned to the rest position by the return spring.

Abstract: A multiple throttle apparatus has a plurality of throttle valves respectively disposed at each air intake passage corresponding to each cylinder of an engine, a plurality of throttle shafts to support the plurality of throttle valves for each group, and a plurality of drive elements to respectively drive the throttle shafts. With this structure, open-close control of one group of the throttle valves and of the other group of throttle valves can be performed separately. Therefore, the combustion condition, namely the power, can adequately be controlled in accordance with the driving conditions, and fine control, even to perform ISC, is possible. In this manner, it becomes possible to obtain electronic control and fine control to a multiple throttle apparatus of an engine mounted on a motorcycle.

Abstract: An intake pressure detecting device for detecting the intake pressure in an intake pipe as information for controlling the operational state of an engine includes an intake pressure detecting sensor for detecting the absolute pressure of the intake air. It further includes a reference voltage power supply for supplying a prescribed reference voltage Vref and a differential amplifier for amplifying the differential between the output voltage Vin from the intake pressure detecting sensor and the reference voltage Vref of the reference voltage power supply. Further, an A/D converter is included for converting the analogue signal output by the differential amplifier to a digital signal. Thereby, the intake pressure can be detected to a high degree of accuracy in a two-cycle engine, for example, which has a relatively low intake negative pressure, while achieving cost reductions.

Abstract: An intake pressure detecting device for detecting the intake pressure in an intake pipe 11 as information for controlling the operational state of an engine comprises an intake pressure detecting sensor 12 for detecting the absolute pressure of the intake air, a reference voltage power supply 13 for supplying a prescribed reference voltage Vref, a differential amplifier 14 for amplifying the differential between the output voltage Vin from the intake pressure detecting sensor 12 and the reference voltage Vref of the reference voltage power supply 13, an A/D converter 15 for converting the analogue signal k·&Dgr;V output by the differential amplifier 14 to a digital signal, and the like. Thereby, the intake pressure can be detected to a high degree of accuracy in a two-cycle engine, for example, which has a relatively low intake negative pressure, whilst achieving cost reductions.